Revert a type checker perf test that apparently is still not consistently fast enough.

Author: rudkx

validation-test/Sema/type_checker_perf/fast/rdar17170728.swift renamed to validation-test/Sema/type_checker_perf/slow/rdar17170728.swift

@@ -1,10 +1,11 @@
-// RUN: %target-typecheck-verify-swift -solver-expression-time-threshold=1 -swift-version 5 -solver-disable-shrink -disable-constraint-solver-performance-hacks -solver-enable-operator-designated-protocols
+// RUN: %target-typecheck-verify-swift -solver-expression-time-threshold=1
 // REQUIRES: tools-release,no_asserts
 
 let i: Int? = 1
 let j: Int?
 let k: Int? = 2
 
 let _ = [i, j, k].reduce(0 as Int?) {
+  // expected-error@-1 {{reasonable time}}
   $0 != nil && $1 != nil ? $0! + $1! : ($0 != nil ? $0! : ($1 != nil ? $1! : nil))
 }